Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d848f882112194…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 04:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3004b366e64f0f204f3a0777e8058a69 SHA-1: 46c625977cb93cd35b00fb365d43cfac17a8362e SHA-256: 63d848f882112194857eb8706ab7bff5936780c1a1ecdf3432b473a5b6c4cd8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also features a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a likely phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gedayapi.com/userfiles/file/majovobebune.pdf In PDF document text
    • http://soflocops.com/clients/67403/File/72422512873.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/lfkrq2eijkon47t3g7etp03dkb/54274598322.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/14808054179.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8564a7cda---37244605550.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/66625368744.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c977ba258---puwomojemamevex.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b99842579---41112157575.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/78979287166.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fad6413c62fc79b24b82abe1650a6e09/27519810620.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/24200945364.pdfIn PDF document text
    • https://ambalatender.com/upload/files/jejuberuwunotapisurake.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/6a10e5ee1eaf63bad71846254ac6a16e/vagukujorigitotatafi.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48864944826.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/898f94cfa7ed99238b6f2870a26a1d3c/joxivemoxojolibidigul.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/95fl68retk39j7brel6dipoh0k/lekosewesiropepizamexubiz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c27338e83---megajezudixuruxixarego.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210823_064857.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/61849456644.pdfIn PDF document text
    • http://salt17.com/userfiles/files/40622179050.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/57747404808.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/64dfa051711baa6d5fccf37c90fbdb4f/wobodadurugapevu.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/j0ilvha4fdgqqj9bv5u4f6omi5/wezofuja.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/32979350390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hukum+hak+kekayaan+intelektual+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 16172 bytes
SHA-256: 489e2b02505d500ca3514b880bb2392ad0981c2ac26d3967a091ab59b3793e6a
font_01_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 10672 bytes
SHA-256: 6de7833240e5995a53b3d2dee1f478daba801b441b2ff62628f12dc27c977844
font_02_sfnt_off00012044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1